WIP bump alloy-evm to af60ab3, remove gas output from execute_transaction

[rakita]

alloy-evm's BlockExecutor::execute_transaction_with_commit_condition and commit_transaction no longer return gas used. Gas tracking is now fully internal to the executor. Callers that need per-transaction gas compute it from receipt cumulative_gas_used differences.

Testing how it would look

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⚠️ Changelog not found.

A changelog entry is required before merging. We've generated a suggested changelog based on your changes:

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---
reth-evm: minor
reth-engine-util: patch
reth-ethereum-payload-builder: patch
reth-rpc-eth-api: patch
reth-rpc: patch
example-custom-beacon-withdrawals: patch
---

Bumped `alloy-evm` to `af60ab3` and removed gas output from `execute_transaction`, which now returns `Result<(), BlockExecutionError>` instead of `Result<u64, BlockExecutionError>`. Callers now read cumulative gas used from the last receipt via `builder.executor().receipts()` instead of using the return value.

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